Method and a system for making a fibre-containing product

Abstract

A method and system for producing fibrous material. Fibrous suspension is supplied onto a wire such that a web is formed and the formed web is dried. After the web formation, the web is kept at least partly in contact with the long wire continuously until the dry matter content of the web exceeds a predetermined limit value, at least to the press section. A system for producing fibrous material in a web forming machine includes fastening members for placing a wire in the machine such that the wire runs continuously from at least the web forming section substantially to the press section.

1 . A method for producing paper, paperboard or corresponding fibre material, in which method
 a pulp suspension is supplied onto a first wire ( 8 ) in such a way that a web ( 10 ) is formed, and   the formed web ( 10 ) is dried,   
       characterized in that further in the method,
 the web ( 10 ) is kept in contact with said same first wire ( 8 ) after the formation of the web ( 10 ) continuously from the web forming section ( 3 ) to the first press nip in the press section. 
 
     
     
         2 . The method according to  claim 1 , characterized in that nanofibrillated cellulose is included in the web and that the content of nanofibrillated cellulose in the web, calculated in dry matter content, is at least 10 wt-%, at least 20 wt-%, at least 30 wt-%, or at least 40 wt-%. 
     
     
         3 . The method according to  claim 2 , characterized in that the content of nanofibrillated cellulose in the web, calculated in dry matter content, is at least 50 wt-%, at least 60 wt-%, at least 70 wt-%, or at least 80 wt-%. 
     
     
         4 . The method according to any of the preceding  claims 1  to  3 , characterized in that said first wire ( 8 ) is supported on at least part of its path on at least one side by means of a second wire ( 9 ). 
     
     
         5 . The method according to  claim 4 , characterized in that in the method, said second wire ( 9 ) used is a wire whose mesh size is greater than the mesh size of said first wire ( 8 ), and/or a wire having a shorter total length than said first wire ( 8 ). 
     
     
         6 . The method according to any of the preceding claims, characterized in that said web is kept in contact with said first wire continuously until the dry matter content of said web is at least 10 wt-%, 12 wt-%, 15 wt-%, 20 wt-%, 25 wt-%, 30 wt-%, 40 wt-%, or at least 50 wt-%. 
     
     
         7 . A system for producing paper, paperboard or corresponding fibrous material, the system comprising a web forming machine ( 1 ) with at least the following parts:
 a first wire ( 8 ),   a web forming section ( 3 ) equipped with means for supplying pulp suspension onto said first wire ( 8 ) for the formation of a web ( 10 ), and   a press section ( 4 ) equipped with means for reducing the moisture content of the web,   
       characterized in that said first wire ( 8 ) is placed in said machine ( 1 ) in such a way that it is arranged to run continuously from at least the web forming section ( 3 ) to the press section ( 4 ), wherein said first wire ( 8 ) supports the web to be formed continuously from the web forming section ( 3 ) to at least the first press nip in the press section. 
     
     
         8 . The system according to  claim 6  or  7 , characterized in that the system further comprises at least a drying section ( 5 ) equipped with means for reducing the moisture content of the web substantially by the effect of temperature, and that said first wire ( 8 ) is placed in said web forming machine ( 1 ) in such a way that said same first wire ( 8 ) runs continuously from at least the web forming section ( 3 ) to the drying section ( 5 ). 
     
     
         9 . The system according to  claim 8 , wherein the drying section ( 5 ) comprises a first drying group, a second drying group and a third drying group, characterized in that said first wire ( 8 ) is placed in such a way that it runs continuously from the web forming section ( 3 ) to at least the second drying group or the third drying group in the drying section ( 5 ). 
     
     
         10 . The system according to any of the  claims 6  to  9 , characterized in that the system comprises not only said first wire ( 8 ) but also a second wire ( 9 ), which second wire ( 9 ) is placed in said web forming machine ( 1 ) to support the first wire ( 8 ) in such a way that said second wire ( 9 ) is at at least some stage in contact with the long wire ( 8 ). 
     
     
         11 . The system according to any of the  claims 6  to  10 , characterized in that the system further comprises a third wire which is placed in said web forming machine ( 1 ) in such a way that also said third wire runs continuously from the web forming section ( 3 ) to the press section ( 4 ) in such a way that also said third wire supports the web to be formed continuously from the web forming section ( 3 ) to at least the first press nip in the press section.